Added greater than and less than propery and date refinement rules

Summary:
The proerty rules add the following;

- Greater Than
- Greater Than Or Equal To
- Less Than
- Less Than Or Equal To

The date rules extend these ensuring that we get a timestamp to compare values.

Test Plan: Visual

Reviewers: brooke, rgooding, JayFrancis

Reviewed By: rgooding

Differential Revision: http://phabricator.cubex.io/D36